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Open Source and information security mailing list archives
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Date: Sat, 29 Dec 2018 15:34:41 -0700
From: Orion Poplawski <orion@...a.com>
To: linux-kernel@...r.kernel.org, Vivek Trivedi <t.vivek@...sung.com>,
Jan Kara <jack@...e.com>
Subject: Re: [PATCH] fanotify: allow freeze on suspend when waiting for
response from userspace
On 12/29/18 3:04 PM, Orion Poplawski wrote:
>> On Thu 22-02-18 15:14:54, Kunal Shubham wrote:
>>> >> On Fri 16-02-18 15:14:40, t.vivek@...sung.com wrote:
>>> >> From: Vivek Trivedi <t.vivek@...sung.com>
>>> >> >> If fanotify userspace response server thread is frozen first,
>>> >> it may fail to send response from userspace to kernel space listener.
>>> >> In this scenario, fanotify response listener will never get response
>>> >> from userepace and fail to suspend.
>>> >> >> Use freeze-friendly wait API to handle this issue.
>>> >> >> Same problem was reported here:
>>> >> https://bbs.archlinux.org/viewtopic.php?id=232270
>>> >> >> Freezing of tasks failed after 20.005 seconds
>>> >> (1 tasks refusing to freeze, wq_busy=0)
>>> >> >> Backtrace:
>>> >> [<c0582f80>] (__schedule) from [<c05835d0>] (schedule+0x4c/0xa4)
>>> >> [<c0583584>] (schedule) from [<c01cb648>]
>>> (fanotify_handle_event+0x1c8/0x218)
>>> >> [<c01cb480>] (fanotify_handle_event) from [<c01c8238>]
>>> (fsnotify+0x17c/0x38c)
>>> >> [<c01c80bc>] (fsnotify) from [<c02676dc>]
>>> (security_file_open+0x88/0x8c)
>>> >> [<c0267654>] (security_file_open) from [<c01854b0>]
>>> (do_dentry_open+0xc0/0x338)
>>> >> [<c01853f0>] (do_dentry_open) from [<c0185a38>] (vfs_open+0x54/0x58)
>>> >> [<c01859e4>] (vfs_open) from [<c0195480>]
>>> (do_last.isra.10+0x45c/0xcf8)
>>> >> [<c0195024>] (do_last.isra.10) from [<c0196140>]
>>> (path_openat+0x424/0x600)
>>> >> [<c0195d1c>] (path_openat) from [<c0197498>] (do_filp_open+0x3c/0x98)
>>> >> [<c019745c>] (do_filp_open) from [<c0186b44>]
>>> (do_sys_open+0x120/0x1e4)
>>> >> [<c0186a24>] (do_sys_open) from [<c0186c30>] (SyS_open+0x28/0x2c)
>>> >> [<c0186c08>] (SyS_open) from [<c0010200>]
>>> (__sys_trace_return+0x0/0x20)
>>> >
>>> > Yeah, good catch.
>>> >
>>> >> @@ -63,7 +64,9 @@ static int fanotify_get_response(struct
>>> fsnotify_group *group,
>>> >> >> pr_debug("%s: group=%p event=%p\n", __func__, group, event);
>>> >> >> - wait_event(group->fanotify_data.access_waitq,
>>> event->response);
>>> >> + while (!event->response)
>>> >> + wait_event_freezable(group->fanotify_data.access_waitq,
>>> >> + event->response);
>>> >
>>> > But if the process gets a signal while waiting, we will just
>>> livelock the
>>> > kernel in this loop as wait_event_freezable() will keep returning
>>> > ERESTARTSYS. So you need to be a bit more clever here...
>>>
>>> Hi Jack,
>>> Thanks for the quick review.
>>> To avoid livelock issue, is it fine to use below change? If agree, I
>>> will send v2 patch.
>>>
>>> @@ -63,7 +64,11 @@ static int fanotify_get_response(struct
>>> fsnotify_group *group,
>>>
>>> pr_debug("%s: group=%p event=%p\n", __func__, group, event);
>>>
>>> - wait_event(group->fanotify_data.access_waitq, event->response);
>>> + while (!event->response) {
>>> + if
>>> (wait_event_freezable(group->fanotify_data.access_waitq,
>>> + event->response))
>>> + flush_signals(current);
>>> + }
>>
>> Hum, I don't think this is correct either as this way if any signal was
>> delivered while waiting for fanotify response, we'd just lose it while
>> previously it has been properly handled. So what I think needs to be done
>> is that we just use wait_event_freezable() and propagate non-zero return
>> value (-ERESTARTSYS) up to the caller to handle the signal and restart
>> the
>> syscall as necessary.
>>
>> Honza
>> --
>> Jan Kara <jack@...e.com>
>> SUSE Labs, CR
>
> Is there any progress here? This has become a real pain for us while
> running BitDefender on EL7 laptops. I tried applying the following to
> the EL7 kernel:
>
> diff -up
> linux-3.10.0-957.1.3.el7.x86_64/fs/notify/fanotify/fanotify.c.orig
> kernel-3.10.0-957.1.3.el7/linux-3.10.0-957.1.3.el7.x86_64/fs/notify/fanotify/fanotify.c
>
> --- linux-3.10.0-957.1.3.el7.x86_64/fs/notify/fanotify/fanotify.c.orig
> 2018-11-15 10:07:13.000000000 -0700
> +++ linux-3.10.0-957.1.3.el7.x86_64/fs/notify/fanotify/fanotify.c
> 2018-12-28 15:44:26.452895337 -0700
> @@ -9,6 +9,7 @@
> #include <linux/types.h>
> #include <linux/wait.h>
> #include <linux/audit.h>
> +#include <linux/freezer.h>
>
> #include "fanotify.h"
>
> @@ -64,7 +65,12 @@ static int fanotify_get_response(struct
>
> pr_debug("%s: group=%p event=%p\n", __func__, group, event);
>
> - wait_event(group->fanotify_data.access_waitq, event->response);
> + while (!event->response) {
> + ret =
> wait_event_freezable(group->fanotify_data.access_waitq,
> + event->response);
> + if (ret < 0)
> + return ret;
> + }
>
> /* userspace responded, convert to something usable */
> switch (event->response & ~FAN_AUDIT) {
>
> but I get a kernel panic shortly after logging in to the system.
>
Here is the panic:
[ 324.774862] ------------[ cut here ]------------
[ 324.774872] WARNING: CPU: 1 PID: 18685 at fs/notify/notification.c:84
fsnotify_destroy_event+0x6b/0x70
[ 324.774874] Modules linked in: cmac ccm xt_CHECKSUM iptable_mangle
ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat
nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT
nf_reject_ipv4 tun bridge stp llc devlink ebtable_filter ebtables
ip6table_filter ip6_tables iptable_filter bnep hid_multitouch iTCO_wdt
iTCO_vendor_support intel_wmi_thunderbolt dell_wmi arc4 iwlmvm
intel_pmc_core intel_powerclamp coretemp intel_rapl mac80211 kvm_intel
vfat fat dell_laptop kvm snd_hda_codec_hdmi dell_smbios
dell_wmi_descriptor dcdbas dell_led irqbypass snd_hda_codec_realtek
snd_soc_skl snd_hda_codec_generic snd_soc_skl_ipc snd_hda_ext_core
snd_soc_sst_dsp iwlwifi snd_soc_sst_ipc snd_soc_acpi snd_soc_core
snd_compress snd_hda_intel snd_hda_codec joydev snd_hda_core snd_hwdep
snd_seq
[ 324.774918] snd_seq_device pcspkr snd_pcm rtsx_pci_ms memstick
uvcvideo cfg80211 videobuf2_vmalloc snd_timer videobuf2_memops
videobuf2_core snd videodev soundcore i2c_i801 btusb btrtl btbcm btintel
bluetooth rfkill idma64 virt_dma i2c_designware_platform
i2c_designware_core wmi pinctrl_sunrisepoint pinctrl_intel intel_hid
sparse_keymap int3400_thermal acpi_pad mei_me mei binfmt_misc
auth_rpcgss sunrpc ip_tables xfs libcrc32c dm_crypt drbg ansi_cprng
rtsx_pci_sdmmc mmc_core crct10dif_pclmul crct10dif_common crc32_pclmul
crc32c_intel i915 ghash_clmulni_intel aesni_intel lrw gf128mul
glue_helper ablk_helper cryptd serio_raw nvme nvme_core rtsx_pci i2c_hid
i2c_algo_bit iosf_mbi drm_kms_helper video ahci syscopyarea sysfillrect
sysimgblt fb_sys_fops libahci drm libata drm_panel_orientation_quirks
dm_mirror
[ 324.774964] dm_region_hash dm_log dm_mod
[ 324.774968] CPU: 1 PID: 18685 Comm: gnome-session-f Kdump: loaded Not
tainted 3.10.0-957.1.3.el7.fanotify.x86_64 #1
[ 324.774970] Hardware name: Dell Inc. XPS 13 9350/0YT4WT, BIOS 1.7.0
01/16/2018
[ 324.774972] Call Trace:
[ 324.774978] [<ffffffffa8961e41>] dump_stack+0x19/0x1b
[ 324.774982] [<ffffffffa8297648>] __warn+0xd8/0x100
[ 324.774986] [<ffffffffa829778d>] warn_slowpath_null+0x1d/0x20
[ 324.774989] [<ffffffffa84892bb>] fsnotify_destroy_event+0x6b/0x70
[ 324.774992] [<ffffffffa848c7a9>] fanotify_handle_event+0x279/0x410
[ 324.774996] [<ffffffffa82c2d00>] ? wake_up_atomic_t+0x30/0x30
[ 324.774999] [<ffffffffa8488c27>] fsnotify+0x2d7/0x510
[ 324.775003] [<ffffffffa84f940e>] security_file_open+0x6e/0x70
[ 324.775007] [<ffffffffa843e9d9>] do_dentry_open+0xb9/0x2e0
[ 324.775010] [<ffffffffa84f8e62>] ? security_inode_permission+0x22/0x30
[ 324.775013] [<ffffffffa843ec9a>] vfs_open+0x5a/0xb0
[ 324.775016] [<ffffffffa844d1a8>] ? may_open+0x68/0x120
[ 324.775018] [<ffffffffa844f7ad>] do_last+0x1ed/0x12a0
[ 324.775043] [<ffffffffc06f387c>] ? xfs_iunlock+0xac/0x130 [xfs]
[ 324.775046] [<ffffffffa84529d2>] path_openat+0x442/0x640
[ 324.775050] [<ffffffffa845406d>] do_filp_open+0x4d/0xb0
[ 324.775053] [<ffffffffa84616f7>] ? __alloc_fd+0x47/0x170
[ 324.775057] [<ffffffffa8440197>] do_sys_open+0x137/0x240
[ 324.775060] [<ffffffffa84402be>] SyS_open+0x1e/0x20
[ 324.775064] [<ffffffffa8974ddb>] system_call_fastpath+0x22/0x27
[ 324.775067] ---[ end trace e834a395da6ce84e ]---
[ 324.775225] ------------[ cut here ]------------
[ 324.775231] WARNING: CPU: 1 PID: 17759 at lib/list_debug.c:33
__list_add+0xac/0xc0
[ 324.775234] list_add corruption. prev->next should be next
(ffff8a8d72d5f9a8), but was ffff8a8d36b7a280. (prev=ffff8a8d36b7a380).
[ 324.775236] Modules linked in: cmac ccm xt_CHECKSUM iptable_mangle
ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat
nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT
nf_reject_ipv4 tun bridge stp llc devlink ebtable_filter ebtables
ip6table_filter ip6_tables iptable_filter bnep hid_multitouch iTCO_wdt
iTCO_vendor_support intel_wmi_thunderbolt dell_wmi arc4 iwlmvm
intel_pmc_core intel_powerclamp coretemp intel_rapl mac80211 kvm_intel
vfat fat dell_laptop kvm snd_hda_codec_hdmi dell_smbios
dell_wmi_descriptor dcdbas dell_led irqbypass snd_hda_codec_realtek
snd_soc_skl snd_hda_codec_generic snd_soc_skl_ipc snd_hda_ext_core
snd_soc_sst_dsp iwlwifi snd_soc_sst_ipc snd_soc_acpi snd_soc_core
snd_compress snd_hda_intel snd_hda_codec joydev snd_hda_core snd_hwdep
snd_seq
[ 324.775281] snd_seq_device pcspkr snd_pcm rtsx_pci_ms memstick
uvcvideo cfg80211 videobuf2_vmalloc snd_timer videobuf2_memops
videobuf2_core snd videodev soundcore i2c_i801 btusb btrtl btbcm btintel
bluetooth rfkill idma64 virt_dma i2c_designware_platform
i2c_designware_core wmi pinctrl_sunrisepoint pinctrl_intel intel_hid
sparse_keymap int3400_thermal acpi_pad mei_me mei binfmt_misc
auth_rpcgss sunrpc ip_tables xfs libcrc32c dm_crypt drbg ansi_cprng
rtsx_pci_sdmmc mmc_core crct10dif_pclmul crct10dif_common crc32_pclmul
crc32c_intel i915 ghash_clmulni_intel aesni_intel lrw gf128mul
glue_helper ablk_helper cryptd serio_raw nvme nvme_core rtsx_pci i2c_hid
i2c_algo_bit iosf_mbi drm_kms_helper video ahci syscopyarea sysfillrect
sysimgblt fb_sys_fops libahci drm libata drm_panel_orientation_quirks
dm_mirror
[ 324.775339] dm_region_hash dm_log dm_mod
[ 324.775344] CPU: 1 PID: 17759 Comm: bdepsecd Kdump: loaded Tainted: G
W ------------ 3.10.0-957.1.3.el7.fanotify.x86_64 #1
[ 324.775348] Hardware name: Dell Inc. XPS 13 9350/0YT4WT, BIOS 1.7.0
01/16/2018
[ 324.775350] Call Trace:
[ 324.775356] [<ffffffffa8961e41>] dump_stack+0x19/0x1b
[ 324.775360] [<ffffffffa8297648>] __warn+0xd8/0x100
[ 324.775364] [<ffffffffa82976cf>] warn_slowpath_fmt+0x5f/0x80
[ 324.775369] [<ffffffffa843ec9a>] ? vfs_open+0x5a/0xb0
[ 324.775373] [<ffffffffa8594c7c>] __list_add+0xac/0xc0
[ 324.775378] [<ffffffffa848d1d6>] fanotify_read+0x2a6/0x5a0
[ 324.775382] [<ffffffffa82c2a10>] ? abort_exclusive_wait+0xa0/0xa0
[ 324.775386] [<ffffffffa844117f>] vfs_read+0x9f/0x170
[ 324.775389] [<ffffffffa844203f>] SyS_read+0x7f/0xf0
[ 324.775393] [<ffffffffa8974ddb>] system_call_fastpath+0x22/0x27
[ 324.775397] ---[ end trace e834a395da6ce84f ]---
[ 324.902124] ------------[ cut here ]------------
[ 324.902132] WARNING: CPU: 0 PID: 18693 at lib/list_debug.c:36
__list_add+0x8a/0xc0
[ 324.902135] list_add double add: new=ffff8a8d36b7a390,
prev=ffff8a8d43b29b70, next=ffff8a8d36b7a390.
[ 324.902136] Modules linked in: cmac ccm xt_CHECKSUM iptable_mangle
ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat
nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT
nf_reject_ipv4 tun bridge stp llc devlink ebtable_filter ebtables
ip6table_filter ip6_tables iptable_filter bnep hid_multitouch iTCO_wdt
iTCO_vendor_support intel_wmi_thunderbolt dell_wmi arc4 iwlmvm
intel_pmc_core intel_powerclamp coretemp intel_rapl mac80211 kvm_intel
vfat fat dell_laptop kvm snd_hda_codec_hdmi dell_smbios
dell_wmi_descriptor dcdbas dell_led irqbypass snd_hda_codec_realtek
snd_soc_skl snd_hda_codec_generic snd_soc_skl_ipc snd_hda_ext_core
snd_soc_sst_dsp iwlwifi snd_soc_sst_ipc snd_soc_acpi snd_soc_core
snd_compress snd_hda_intel snd_hda_codec joydev snd_hda_core snd_hwdep
snd_seq
[ 324.902187] snd_seq_device pcspkr snd_pcm rtsx_pci_ms memstick
uvcvideo cfg80211 videobuf2_vmalloc snd_timer videobuf2_memops
videobuf2_core snd videodev soundcore i2c_i801 btusb btrtl btbcm btintel
bluetooth rfkill idma64 virt_dma i2c_designware_platform
i2c_designware_core wmi pinctrl_sunrisepoint pinctrl_intel intel_hid
sparse_keymap int3400_thermal acpi_pad mei_me mei binfmt_misc
auth_rpcgss sunrpc ip_tables xfs libcrc32c dm_crypt drbg ansi_cprng
rtsx_pci_sdmmc mmc_core crct10dif_pclmul crct10dif_common crc32_pclmul
crc32c_intel i915 ghash_clmulni_intel aesni_intel lrw gf128mul
glue_helper ablk_helper cryptd serio_raw nvme nvme_core rtsx_pci i2c_hid
i2c_algo_bit iosf_mbi drm_kms_helper video ahci syscopyarea sysfillrect
sysimgblt fb_sys_fops libahci drm libata drm_panel_orientation_quirks
dm_mirror
[ 324.902233] dm_region_hash dm_log dm_mod
[ 324.902237] CPU: 0 PID: 18693 Comm: dbus-launch Kdump: loaded
Tainted: G W ------------
3.10.0-957.1.3.el7.fanotify.x86_64 #1
[ 324.902239] Hardware name: Dell Inc. XPS 13 9350/0YT4WT, BIOS 1.7.0
01/16/2018
[ 324.902241] Call Trace:
[ 324.902247] [<ffffffffa8961e41>] dump_stack+0x19/0x1b
[ 324.902251] [<ffffffffa8297648>] __warn+0xd8/0x100
[ 324.902254] [<ffffffffa82976cf>] warn_slowpath_fmt+0x5f/0x80
[ 324.902258] [<ffffffffa83df5b7>] ?
anon_vma_interval_tree_insert+0x97/0xa0
[ 324.902261] [<ffffffffa83f6557>] ? anon_vma_chain_link+0x37/0x40
[ 324.902265] [<ffffffffa8594c5a>] __list_add+0x8a/0xc0
[ 324.902269] [<ffffffffa83f654a>] anon_vma_chain_link+0x2a/0x40
[ 324.902273] [<ffffffffa83f8909>] anon_vma_fork+0xe9/0x130
[ 324.902277] [<ffffffffa82947f3>] dup_mm+0x473/0x750
[ 324.902281] [<ffffffffa8295f52>] copy_process+0x1452/0x1a40
[ 324.902285] [<ffffffffa82966f1>] do_fork+0x91/0x320
[ 324.902289] [<ffffffffa8296a06>] SyS_clone+0x16/0x20
[ 324.902293] [<ffffffffa89751a4>] stub_clone+0x44/0x70
[ 324.902297] [<ffffffffa8974ddb>] ? system_call_fastpath+0x22/0x27
[ 324.902300] ---[ end trace e834a395da6ce850 ]---
[ 324.902316] BUG: unable to handle kernel paging request at
00007f96c05d8000
[ 324.902319] IP: [<ffffffffa841bf64>] kmem_cache_alloc+0x74/0x1f0
[ 324.902325] PGD 8000000143adc067 PUD 1493c1067 PMD 14386a067 PTE
8000000132ff2865
[ 324.902330] Oops: 0001 [#1] SMP
[ 324.902333] Modules linked in: cmac ccm xt_CHECKSUM iptable_mangle
ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat
nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT
nf_reject_ipv4 tun bridge stp llc devlink ebtable_filter ebtables
ip6table_filter ip6_tables iptable_filter bnep hid_multitouch iTCO_wdt
iTCO_vendor_support intel_wmi_thunderbolt dell_wmi arc4 iwlmvm
intel_pmc_core intel_powerclamp coretemp intel_rapl mac80211 kvm_intel
vfat fat dell_laptop kvm snd_hda_codec_hdmi dell_smbios
dell_wmi_descriptor dcdbas dell_led irqbypass snd_hda_codec_realtek
snd_soc_skl snd_hda_codec_generic snd_soc_skl_ipc snd_hda_ext_core
snd_soc_sst_dsp iwlwifi snd_soc_sst_ipc snd_soc_acpi snd_soc_core
snd_compress snd_hda_intel snd_hda_codec joydev snd_hda_core snd_hwdep
snd_seq
[ 324.902376] snd_seq_device pcspkr snd_pcm rtsx_pci_ms memstick
uvcvideo cfg80211 videobuf2_vmalloc snd_timer videobuf2_memops
videobuf2_core snd videodev soundcore i2c_i801 btusb btrtl btbcm btintel
bluetooth rfkill idma64 virt_dma i2c_designware_platform
i2c_designware_core wmi pinctrl_sunrisepoint pinctrl_intel intel_hid
sparse_keymap int3400_thermal acpi_pad mei_me mei binfmt_misc
auth_rpcgss sunrpc ip_tables xfs libcrc32c dm_crypt drbg ansi_cprng
rtsx_pci_sdmmc mmc_core crct10dif_pclmul crct10dif_common crc32_pclmul
crc32c_intel i915 ghash_clmulni_intel aesni_intel lrw gf128mul
glue_helper ablk_helper cryptd serio_raw nvme nvme_core rtsx_pci i2c_hid
i2c_algo_bit iosf_mbi drm_kms_helper video ahci syscopyarea sysfillrect
sysimgblt fb_sys_fops libahci drm libata drm_panel_orientation_quirks
dm_mirror
[ 324.902423] dm_region_hash dm_log dm_mod
[ 324.902428] CPU: 0 PID: 18693 Comm: dbus-launch Kdump: loaded
Tainted: G W ------------
3.10.0-957.1.3.el7.fanotify.x86_64 #1
[ 324.902430] Hardware name: Dell Inc. XPS 13 9350/0YT4WT, BIOS 1.7.0
01/16/2018
[ 324.902433] task: ffff8a8c3108c100 ti: ffff8a8d3e4a0000 task.ti:
ffff8a8d3e4a0000
[ 324.902435] RIP: 0010:[<ffffffffa841bf64>] [<ffffffffa841bf64>]
kmem_cache_alloc+0x74/0x1f0
[ 324.902441] RSP: 0018:ffff8a8d3e4a3d30 EFLAGS: 00010282
[ 324.902443] RAX: 0000000000000000 RBX: 0000000000000000 RCX:
00000000000bd1d1
[ 324.902445] RDX: 00000000000bd1d0 RSI: 00000000000000d0 RDI:
ffff8a8d7a001b00
[ 324.902447] RBP: ffff8a8d3e4a3d60 R08: 000000000001f0a0 R09:
ffffffffa83f88c3
[ 324.902450] R10: ffff8a8d43b29af8 R11: ffff8a8d3e4a396e R12:
00007f96c05d8000
[ 324.902452] R13: 00000000000000d0 R14: ffff8a8d7a001b00 R15:
ffff8a8d7a001b00
[ 324.902455] FS: 00007f96c3eb6880(0000) GS:ffff8a8d7ec00000(0000)
knlGS:0000000000000000
[ 324.902458] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 324.902460] CR2: 00007f96c05d8000 CR3: 000000014389a000 CR4:
00000000003607f0
[ 324.902463] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[ 324.902465] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
0000000000000400
[ 324.902467] Call Trace:
[ 324.902472] [<ffffffffa83f88c3>] ? anon_vma_fork+0xa3/0x130
[ 324.902476] [<ffffffffa83f88c3>] anon_vma_fork+0xa3/0x130
[ 324.902480] [<ffffffffa82947f3>] dup_mm+0x473/0x750
[ 324.902484] [<ffffffffa8295f52>] copy_process+0x1452/0x1a40
[ 324.902488] [<ffffffffa82966f1>] do_fork+0x91/0x320
[ 324.902492] [<ffffffffa8296a06>] SyS_clone+0x16/0x20
[ 324.902497] [<ffffffffa89751a4>] stub_clone+0x44/0x70
[ 324.902500] [<ffffffffa8974ddb>] ? system_call_fastpath+0x22/0x27
[ 324.902503] Code: 52 bf 57 49 8b 50 08 4d 8b 20 49 8b 40 10 4d 85 e4
0f 84 28 01 00 00 48 85 c0 0f 84 1f 01 00 00 49 63 46 20 48 8d 4a 01 4d
8b 06 <49> 8b 1c 04 4c 89 e0 65 49 0f c7 08 0f 94 c0 84 c0 74 ba 49 63
[ 324.902545] RIP [<ffffffffa841bf64>] kmem_cache_alloc+0x74/0x1f0
[ 324.902549] RSP <ffff8a8d3e4a3d30>
[ 324.902551] CR2: 00007f96c05d8000
--
Orion Poplawski
Manager of NWRA Technical Systems 720-772-5637
NWRA, Boulder/CoRA Office FAX: 303-415-9702
3380 Mitchell Lane orion@...a.com
Boulder, CO 80301 https://www.nwra.com/
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